Pfo closing device

ABSTRACT

A PFO closing device for bringing the septum primum and the septum secundum into contact with each other and joining them together includes a clamping mechanism and energy supplying device. The clamping mechanism includes a needle part for puncturing the septum primum, and a clamping member for cooperating with the needle part in clamping therebetween tissue of the septum primum and the septum secundum. The energy supplying device supplies energy for joining the tissues clamped by the needle part and the clamping member. The clamping mechanism is mounted in a catheter so as to be protrudable from and retractable into the catheter.

This application is a continuation of application Ser. No. 12/230,090filed Aug. 22, 2008, which is a continuation of InternationalApplication No. PCT/JP2007/053977 filed on Feb. 23, 2007, the entirecontent of both of which is incorporated herein by reference. Thisapplication also claims priority under 35 U.S.C. §119(a) to JapaneseApplication No. 2006-047636 filed on Feb. 24, 2006, the entire contentof which is also incorporated herein by reference.

TECHNOLOGICAL FIELD

The present invention generally relates to a medical device. Morespecifically, the invention pertains to a patent foramen ovale (PFO)closing device for closing a PFO in a person's heart.

BACKGROUND DISCUSSION

Recently, patent foramen ovale (hereinafter referred to as PFO) has beenidentified as a cardiac factor in strokes and migraines. The PFO is asymptom in which the oval foramen (foramen ovale) for shortcircuitingblood between the left and right sides in the heart in the fetal periodof a person's life remains even after the person has gown up. It is saidthat 20-30% of grown-up people have this disease.

The PFO is generated in the septum secundum (hereinafter referred to asSP) of a heart. In a heart at normal time, the blood pressure in theleft atrium of heart is higher than that in the right atrium of heart,so that the oval foramen is closed with the septum primum (hereinafterreferred to as SP). However, when the blood pressure in the right atriumof the heart exceeds that in the left atrium of heart in certaincircumstances (for example, at the time of coughing or straddling), theSP opens to the side of the left atrium of heart, resulting in bloodflow from the side of the right atrium of heart (the vein side) to theside of the left atrium of heart (the artery side). If thrombi arecontained in the blood in this case, the thrombi are transferred fromthe vein side to the artery side, and flow from the left atrium of heartinto the left ventricle, then into the aorta and into the brain,possibly causing a stroke or migraine.

Examples of the treatment of such a disease include pharmacotherapy(aspirin, warfarin, or the like), closure of the PFO by percutaneouscatheterization, and open heart surgery by extracorporeal circulation.Pharmacotherapy is the treatment which should be selected first, but itcan be difficult to manage the dosage, and bleeding may not cease easilyduring the dosage. Percutaneous catheterization and the open heartsurgery are radical treatments and remove the fear of recurrence, thoughthey are invasive procedures. At the present stage, of these closureprocedures, open heart surgery is more assured. However, taking intoaccount the risk attendant on the extracorporeal circulation and themagnitude of the invasion attendant on skin incision, the treatment bypercutaneous catheterization is more desirable, if it produces the sameeffect as that of the open heart surgery.

Devices for closure by use of percutaneous catheterization can be usedalso in the cases of closing a defect, such as cogenital atrial septaldefect (ASD), PFO, ventricular septal defect (VSD), patent ductusarteriosus (PDA), etc. The conventional devices, however, are based onclamping the SP and the SS by use of a disk-like membrane or anchormember for closing the defect, and they are left indwelling in thepatient's body.

The membrane and the anchor member are foreign matters for the body, andthrombi are liable to deposit thereon. Particularly, when a thrombusdeposits on the disk-like membrane on the side of the left atrium of theheart, it may flow downstream to cause stroke, or may break the SP whichis small in wall thickness. In addition, these members may bepositionally deviated, instead of being positionally fixed in the stateof clamping the relevant tissues.

In view of these points, recently, there has been proposed the PFOclosing device as described in WO2004/086944 A2 (refer to Abstract, FIG.10, etc.).

In use of this PFO closing device, the appliance is passed through thePFO from the right atrium of heart toward the left atrium of heart, theSP is drawn to the PFO to close the latter, and energy is appliedthereto so as to join the tissues to each other.

SUMMARY

A patent foramen oval (PFO) closing device for bringing the septumprimum and the septum secundum into contact with each other and joiningthem together comprises a catheter dimensioned to be positioned in aliving body and advanced into an atrium of a heart, a needle partslidably positioned inside the catheter for puncturing the septumprimum, a clamping member mounted on the catheter and cooperable withthe needle part to clamp, between the clamping member and the needlepart, tissue of the septum primum and the septum secundum, and an energysupplying means operatively connected to at least one of the needle partand the clamping member for supplying energy to join the tissue clampedbetween the needle part and the clamping member. The PFO closing deviceposses a relatively simple configuration, yet allows the SP and the SSto be reliably joined to each other through a relatively easy procedure,without leaving any foreign matter indwelling in the patient's body.

The PFO closing device posses a relatively simple configuration, yetallows the SP and the SS to be reliably joined to each other through arelatively easy procedure, without leaving any foreign matter indwellingin the patient's body.

According to another aspect, a PFO closing therapeutic method involvespositioning a needle part at a central portion of a PFO, holding the SP(septum primum) so as to be non-retractable relative to the puncturingdirection of the needle part, puncturing the SP with a needle, bringingthe SP and the SS into contact with each other by clamping with theneedle part and a clamping member, and passing an electric current inthe needle part and the clamping member to thereby join the SP and theSS to each other.

The PFO closing device is wholly mounted in the catheter so as to beprotrudable and retractable, so that by feeding the PFO closing devicein the state of being retracted into the catheter, the device can be fedto a diseased (affected) part comparatively easily. In the case of theprocedure, also, since the tissues are clamped in the condition wherethe needle part has punctured the SP, the SP and the SS can berelatively easily clamped, irrespective of the variety in the forms ofthem. Particularly where the part to be fused is set at the entrance ofthe PFO as viewed from the side of the right atrium of heart and the SPis punctured by the needle part, the tissues can be assuredly joined toeach other, without any influence of the degree of overlap of themembranes, the thickness and shape of the membranes, or the like arisingfrom the individual differences in the shape of the SP.

In the case of clamping the tissue by the needle part and the clampingmember, the tissues are clamped elastically (springy). Therefore, apress bonding force which follows up to the tissues shrunk by heatingcan be exerted in a relatively sustained manner so that the adhesionfactors such as melted collagen and elastin can be press bonded in adesired shape.

Since a relatively small-diameter and substantially rectilinear needlepart is used as an electrode on one side of the clamping means, thetissues composed of the SP and the SS can be joined to each otherwithout forming any hole greater than the needle-punctured hole, so thatleakage of blood can be minimized.

Since substantially the needle part and the clamping member or both ofthem together with holding means are only stored in the catheter, thepresent device is simple in configuration, which facilitates theprocedure.

The present device, when having the holding means, holds the tissuescomposed of the SP and the SS at the time of puncturing. Therefore, thepuncturing operation or the joining operation can be performedaccurately and assuredly, whereby the procedure can be made to beaccurate, speedy and easy.

Particularly where the present device has holding means including apositioning part for positioning the needle part relative to the PFO anda holding part for holding the SP so that the SP cannot be retractedrelative to the needle part, the operation of positioning the needlepart and the operation of holding the SP can be carried out in anundivided manner. Therefore, even a thin-walled SP can be punctured at apredetermined position, without breakage or damage. This enhanceslargely the safety and easiness of the procedure, and the procedure canbe carried out accurately and speedily. Particularly, the positioningand holding means ensures that the positioning of the needle part andthe holding of the SP can be performed by only operating the operatingmember to move axially forwards or rearwards, so that the convenience orfacility of the procedure is enhanced.

Preferably, the positioning and holding means has a main tube passedthrough the catheter and capable of being operated externally, anoperating member provided in the main tube so as to be movable axiallyforwards and rearwards, is protruded from the distal end of the maintube, an intermediate sleeve body and a tip sleeve body are providedcoaxially with the operating member, and a contact member brought intocontact with the tip sleeve body by pulling the operating member isprovided at a distal end portion of the operating member. The tip sleevebody and the intermediate sleeve body are connected to each other by afirst elastic wire member, and the intermediate sleeve body and the tipsleeve body are connected to each other by a second elastic wire memberdeformable more easily than the first elastic wire member. The secondelastic wire member is curved outwards by pulling the operating memberto thereby function as the positioning part making springy contact withthe inner edge of the PFO. The first elastic wire member between the tipsleeve body and the contact member and the intermediate sleeve body iscurved by further pulling the operating member to thereby function as aholding part for holding the SP by the tip sleeve body and the contactmember. This configuration helps ensure that the positioning and theholding of the SP can be performed more assuredly, thereby enhancing thesafety, facility, accurateness, and speediness of the procedure.Preferably, the positioning and holding means has a structure in which amain tube capable of being, operated externally protrudes from thedistal end of the catheter, an operating member movable axially forwardsand rearwards is provided in the main tube, and an elastic second sleevebody is disposed at a distal end portion of the main tube. A positioningpiece formed at a proximal portion of the second sleeve body is curvedoutwards by pulling, by the operating member, the second sleeve bodyprotruded from the main tube, to thereby function as the positioningpart making springy contact with the inner edge of the PFO, and a distalend portion of the second sleeve body is curved by further pulling theoperating member to thereby function as a holding part for holding theSP from the side of the left atrium of heart. This ensures not only thesafety, facility, accurateness, and speediness of the procedure but alsoa simpler configuration of the PFO closing device.

Preferably, the positioning and holding means has a positioning partincluding a pair of elastic wire members protruding from a distal endportion of the catheter so as to be opened wider, and a holding part forholding the SP in a non-retractable manner by a projected part formed atthe center of an M shape into which distal end portions of the elasticwire members are deformed. This helps ensure not only the safety,facility, accurateness, and speediness of the procedure but also asimpler configuration of the PFO closing device and inexpensiveness ofthe device.

The positioning and holding means has a main tube passing through thecatheter and capable of being operated externally, an operating memberprovided in the main tube so as to be movable axially forwards andrearwards is protruded from the distal end of the main tube, anintermediate sleeve body and a tip sleeve body are provided coaxiallywith the operating member, and a contact member brought into contactwith the tip sleeve body by pulling the operating member is provided ata distal end portion of the operating member; the main tube and theintermediate sleeve body—are connected to each other by a first elasticwire member, the intermediate sleeve body and the tip sleeve body areconnected to each other by a second elastic wire member and a thirdelastic wire member projectingly deformable more easily than the secondelastic wire member; the first elastic wire member is curved outwards bypulling the operating member to thereby function as the positioning partmaking springy contact with the inner edge of the foramen ovale, and byfurther pulling the operating member, the second elastic wire member iscurved so that the tip sleeve body and the contact member function as aholding part for holding the septum primum, and the third elastic wiremember is curved outwards to thereby function as a crease smoothing partfor smoothing out creases present in the septum primum. This alsoensures not only the safety, facility, accurateness, and speediness ofthe procedure but also a simpler configuration of the PFO closingdevice.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view showing the use of a firstembodiment of the PFO closing device disclosed herein.

FIG. 2 is an enlarged perspective view of a part of the device accordingto the first embodiment.

FIG. 3 is a cross-sectional view of the device taken along the sectionline 3-3 in FIG. 2.

FIG. 4 is a cross-sectional view showing the condition where a needlepart is protruded from a catheter.

FIG. 5 is a cross-sectional view showing the condition where tissues aregripped between the needle part and the gripping member of the device.

FIG. 6 is a schematic perspective view of a second embodiment of the PFOclosing device disclosed herein.

FIG. 7 is an enlarged cross-sectional view of a part of the deviceillustrated in FIG. 5, showing the stored condition of the PFO closingdevice according to the second embodiment.

FIG. 8 is a schematic cross-sectional view showing the condition where agripping member is in contact with a guiding catheter.

FIG. 9 is a schematic cross-sectional view showing the condition wherethe gripping member is pushed by the guiding catheter.

FIG. 10 is a schematic perspective view of a third embodiment of the PFOclosing device disclosed herein.

FIG. 11 is a front view of a support.

FIG. 12 is a side cross-sectional view of the third embodiment of theclosing device.

FIG. 13 is a plan cross-sectional view of the third embodiment of theclosing device.

FIG. 14 is a side cross-sectional view of a part of the third embodimentof the device showing the gripping condition.

FIG. 15 is a view showing the inserted condition of positioning means.

FIG. 16A is a front view of a PFO part as viewed from the side of aright atrium of heart R, and FIG. 16B is a cross-sectional view alongthe section line B-B of FIG. 16A.

FIG. 17 is a view showing a puncture condition.

FIG. 18 is a view showing the puncture condition as viewed from the sideof the left atrium of heart.

FIG. 19 is a view of a clamping condition as viewed from the side of theright atrium of heart.

FIG. 20 is a schematic perspective view of a fourth embodiment of thePFO closing device disclosed herein.

FIG. 21 is a front view of a support;

FIG. 22 is a side view of the fourth embodiment of the device shown inFIG. 21.

FIG. 23 is a plan cross-sectional view of the fourth embodiment of thedevice.

FIG. 24 is a side cross-sectional view of a part of the device showingthe gripping condition of the fourth embodiment.

FIG. 25 is a schematic perspective view of a PFO closing deviceaccording to a fifth embodiment disclosed herein.

FIG. 26 is an end cross-sectional view taken along the section line26-26 of FIG. 25.

FIG. 27 is a cross-sectional plan view of a hand-operated operating partof the PFO closing device.

FIGS. 28A-28D are schematic views showing operating conditions ofpositioning and holding means in the fifth embodiment.

FIG. 29 is a schematic perspective view of a sixth embodiment of the PFOclosing device disclosed herein.

FIG. 30 is a schematic perspective view of a seventh embodiment of thePFO closing device.

FIG. 31 is a schematic perspective view showing a deformed condition ofthe seventh embodiment;

FIG. 32 is a schematic perspective view showing an eighth embodiment ofthe closing device.

FIG. 33 is a schematic perspective view of the eight embodiment of theclosing device showing the condition where a SP is caught.

FIG. 34 is an end view of the device shown in FIG. 32 seen from thedirection of the indicated by the line 34-34 in FIG. 32.

DETAILED DESCRIPTION

A first embodiment of the PFO closing device disclosed here is describedwith reference to FIGS. 1-3. As shown in FIG. 1, the PFO closing deviceaccording to this embodiment generally includes clamping means 1 forclamping a septum primum (hereinafter referred to as SP M2) and a septumsecundum (hereinafter referred to as SS M1), and energy-supplying means20 for supplying energy to join the tissues clamped by the clampingmeans 1. The clamping means 1 is movably positioned in the distal end(tip) of an elongated member 30, which includes a lumen, in a mannerallowing the clamping means 1 to protrude out of and retract into (e.g.,be movable forward and rearward) the elongated member. In theillustrated embodiment, the elongated hollow member (elongatedlumen-possessing member) is a percutaneous catheter 30. In use, theclamping means 1, while being wholly stored or positioned in thecatheter 30, is inserted in an inferior vena cava J. Then, in performingthe procedure, the clamping means 1 protrudes from the distal end of thecatheter 30, and the tissues of the SS M1 and the SP M2 of a heart inwhich a defect 0 (FIG. 4) of Patent Foramen Ovale (hereinafter referredto also as PFO O) exists are clamped. In this condition, the tissues arejoined by the energy supplied to the clamping means 1, whereby thedefect 0 is closed.

More specifically, as shown in FIGS. 1-3, the clamping means 1 in thisembodiment is a forceps-like clip composed of a needle part 2 forpuncturing the SP M2 tissue, and a clamping member 3 cooperating withthe needle part 2 to clamp the tissues composed of the SS M1 and the SPM2.

In this illustrated embodiment, the needle part 2 is comprised of twopointed wire members fixedly attached to a distal end portion of a firstplate 4. The clamping member 3 includes a second plate 5, and the firstplate 4 and the second plate 5 are moved to open and close, with a baseshaft 6 as a center. An operating member 7 is attached to the proximal(rear) end side of the first plate 4, and the entire clamping means 1 ismoved forwards and rearwards in the catheter 30 by moving the operatingmember 7 forwards and rearwards. The gripping force between the needlepart 2 and the clamping member 3 is generated by an urging member(urging means) 8 seen in FIG. 3 provided between the first plate 4 andthe second plate 5 which applies an urging force. In the illustratedembodiment, the urging member is in the form of a spring providedbetween the first plate 4 and the second plate 5.

The operating member 7, which can be composed of a comparatively stiffwire member, need not necessarily be connected to the needle part 2side, and may instead be connected to the clamping member 3. Theoperating member 7 may be of any desired construction allowing it tomove the clamping means 1 forwards and rearwards inside the catheter 30.By way of example, a wire of stainless steel, an Ni—Ti alloy, titanium,or the like can be used as the operating member 7.

In this embodiment, as shown in FIG. 2, the needle part 2 for puncturingthe SP M2 is comprised of two sharp-pointed extremely-small-diameterwire members disposed in spaced apart relation to one another. When theSP M2 is punctured by such a needle part 2, the SP and the SS can beeasily clamped, irrespective of their shapes. The needle part 2 (i.e.,the pointed members forming the needle part 2) need not necessarily besolid, and may be hollow or annular. The outside diameter of each of thepointed members forming the needle part 2 is preferably in the range of0.1 to 2 mm, for mounting it in the catheter 30. The material formingthe needle part 2 is ordinarily SUS. However, other materials which donot exert bad influence on living bodies, such as gold, silver,platinum, tungsten, palladium, titanium, and alloys thereof can also beused. The spacing (interval) between the two members forming the needleparts 2 is not particularly limited, and may be in a certain range suchthat the SP M2 and the SS M1 can be clamped. In addition, the number ofmembers forming the needle part 2 is not limited to two, and may bemore.

The clamping member 3 may be a wholly flat plate-like member having apredetermined width so that it can cooperate with the pointed members ofthe needle part 2 in clamping the tissues of the SS M1 and the SP M2therebetween. In this embodiment, to prevent slip-off or displacementand achieve secure gripping, the clamping member 3 is preferablyprovided with a rugged surface or rugged part 5 a (roughened or knurledsurface) on the clamping face side (the side facing the needle part 2).A traction wire 9 is connected to the proximal (rear) end of theclamping member 3 so that when the traction wire 9 is pulled axiallyrearwards, the clamping member 3 is moved away from the needle part 2(i.e., moved towards an open position), with the base shaft 6 as acenter, against the elasticity of the urging means 8. When the tractionis relaxed, the clamping member 3 is closed toward the needle part 2 bythe elasticity of the urging means 8 to achieve gripping. The tractionwire 9 preferably has a structure, as for example shown in FIG. 3, inwhich a looped hook member 10 is provided at the proximal end of thefirst plate 4, and the traction wire 9 is extended to pass through thelooped hook member 10, whereby the clamping member 3 can be relativelysmoothly opened and closed relative to the needle part 2.

In this embodiment, the energy supplying means 20 is composed of anelectricity supplying unit 2OA for melting the SP M2 and the SS M1electrothermally and press bonding with an adhesion factor such ascollagen and elastin. Particularly, in the case of clamping by theneedle part 2 and the clamping member 3, the elasticity of the urgingmeans 8 is constantly applied during clamping. Therefore, it is possibleto apply, in a sustained manner, a press bonding force which follows upto the tissues thermally contracted, and to press bond the adhesionfactor such as collagen and elastin in a desired shape.

For example, one end of one lead wire 21 is connected to the proximalend of the needle parts 2, and one end of the other lead wire 22 isconnected to the proximal end of the clamping member 3. The other endsof these lead wires 21, 22 are contained in an insulating tube 23, areguided through the catheter 30 to the exterior, and are connected to theelectricity supplying unit 2OA. The electricity supplying unit 2OA iscomposed of a power supply, a control unit for controlling the current,etc., and it has a known system configuration, the description of whichis omitted here. The power supply may not necessarily be a DC powersupply, and may be an AC power supply.

The energy supplying means 20 is not limited to an electrical powersupply as described, but may be any one that can supply an energycapable of mutually joining the SP M2 and the SS M1 clamped by theclamping means 1. For example, ultrasonic wave, laser, microwave, orhigh-frequency wave can be used as a source of energy. In addition, asthe energy supply system, there can be used a monopolar system in whichan electric current is passed between the needle part 2 or the clampingmember 3 on the side of the right atrium of heart R and acounter-electrode plate provided on the back side, a bipolar system inwhich an electric current is passed between the clamping member 3 on theside of the right atrium of heart R and the needle part 2 on the side ofthe left atrium of heart L, or the like system. Where a bipolar system,in which an electric current is controlled according to the impedance ofthe tissues between the needle part 2 and the clamping member 3, is usedas the energy supplying means 20, it is possible to relatively easilycope with the conditions of the tissues of the SP M2 and the SS M1,which differ from patient to patient, and it is possible to obtainsafety and facility of the procedure.

In this embodiment, the clamping means 1 is clip-like in form, andsliding friction may be generated between itself and the catheter 30, sothat the needle parts 2 and the like are not liable to slip inside thecatheter 30. In view of this, positioning means 40 (described later) forpositioning the needle part 2 at a predetermined position relative tothe PFO O is not provided here. However, such positioning means 40 maybe provided if desired.

Now, the operations involving the use of this embodiment are describedbelow.

FIG. 4 illustrates a condition in which the needle part protrudes fromthe catheter, and FIG. 5 illustrates a condition where the tissues aregripped between the needle part and the gripping member. First, theoperator inserts a guide wire into a patient's body, then passes oradvances a guiding catheter while using the guide wire as a guide. Theguiding catheter is brought forwards to the right atrium of the heart R.When the distal end of the guide wire reaches the position of the PFO(O) of the heart and the guiding catheter has reached a positionimmediately before the PFO position, the position is maintained. Where aradiopaque material (for example, gold, silver, platinum, tungsten,palladium, or alloys thereof) is provided as a so-called marker at, forexample, the distal end of the guide wire, the catheter member 13 can beinserted while confirming the position thereof by irradiation withX-rays or the like, and the position in the patient's body can berelatively accurately determined.

Using as a guide the guide wire preliminarily located at the position ofthe PFO, the catheter 30 with the needle part 2 and the clamping means 1positioned or stored therein is inserted through the inferior vena cavaJ into the patient's body, as shown in FIGS. 2 and 3. Though thecatheter 30 is relatively small in diameter and flexible as a whole, itcan be relatively easily inserted when the stiffer guide wire is used asa guide. When the distal end of the catheter 30 protrudes from (distallybeyond) the distal end of the guiding catheter and has reached theposition of the PFO, the guide wire is evulsed or removed.

Subsequently, by operating the operating member 7, the needle parts 2and the clamping member 3 for clamping protrude from the catheter 30.Then, as shown in FIG. 4, by operating the operating member 7, theneedle part 2 protruding relative to the clamping means 3 is operated topuncture the SP M2 in the vicinity of the PFO 0.

In this condition, the traction wire 9 is pulled axially rearwards(proximally), and both the clamping member 3 and the needle part 2 areopened against the urging means 8 (so that the clamping member 3 andneedle part relatively move away from each other), with the base shaft 6as a center, upon which the clamping member 3 is opened wider from theneedle part 2. In this way, the SS M1 and the SP M2 can be clamped in amutually overlapping state between the clamping member 3 and the needlepart 2. In this clamping condition, the pulling force acting on thetraction wire 9 is removed, upon which the SS M1 and the SP M2positioned in an overlapping manner between the clamping member 3 andthe needle part 2 as shown in FIG. 5 are pressed in a sustained mannerby the urging force of the urging member 8 (i.e., the spring or biasingforce of the urging means).

Then, the electricity supplying unit 2OA is controlled to supply apredetermined current through the lead wires 21, 22, whereby the currentis passed between the clamping member 3 and the needle part 2, and bothtissues of the SS M1 and the SP M2 are heated. While applying the pressbonding force which follows up to the tissues contracted by the heating,the adhesion factor such as collagen and elastin thus melted is pressbonded in a desired shape.

When the tissues are fused to each other, the passage of current isstopped, the traction wire 9 is pulled to move the clamping member 3away from the tissues, and the needle part 2 is evulsed from the SP M2.Though extremely tiny holes are left in the SP M2 after evulsion of theneedle parts 2, they are relatively easily cured (healed) thereafter.Therefore, there is virtually no possibility of generation of thrombi orthe like.

Then, the operating member 7 is operated to store or position theclamping means into the catheter 30 through the distal end of thelatter, and the catheter 30 as a whole is evulsed or removed from thepatient's body.

A second embodiment of the PFO closing device is illustrated in FIGS.6-9. In the description which follows, features of the second embodimentof the closing device which are the same as those associated with thefirst embodiment are identified by the same reference numeral, and adetailed description of such features is not repeated.

The PFO closing device according to this second embodiment is preferablefrom the standpoint that the clamping means 1 can be stored orpositioned in a catheter 30 in a more compact manner.

As shown in FIG. 6, the PFO closing device in this embodiment generallyincludes a guiding catheter 31, the catheter 30, the clamping means 1,positioning means 40, and energy supplying means similar to the energysupply means of the first embodiment. The guiding catheter 31 isprovided at an outermost portion of the device. The catheter 30 ispositioned in the guiding catheter 31. The clamping means 1 includes theneedle part 2 positionally fixedly provided inside the catheter 30 toprotrude from the distal end of the catheter 30, and a clamping member3A turnably provided in the outside of the distal end portion of thecatheter 30. The positioning means 40 is for positioning the needle part2 at the center of the PFO 0.

As shown in FIG. 7, the needle part 2 constituting one side of theclamping means 1 has its base end (proximal end) fixedly attached to theinside of the distal end portion of the catheter 30 which is positionedinside the guiding catheter 31, and its distal end portion protrudingfrom the distal end of the catheter 30 so that the needle part 2 canpuncture a desired tissue when the catheter 30 protrudes from theguiding catheter 31.

As shown in FIG. 6, the clamping member 3A constituting the other sideof the clamping means 1 is composed only of a generally U-shaped wiremember, having proximal ends (base ends) that are slightly bent. Thebent proximal ends 11 are fitted into through-holes 12 opening into thecatheter 30. The clamping member 3A is thus attached to the catheter 30so as to be turnable relative to the catheter 30. Accordingly, at thetime of storage in which the catheter 30 is axially retracted relativeto the guiding catheter 31, the clamping member 3A is in a rearwardlyfallen position (hereinafter referred to as rearward inclined position)as shown in FIG. 7. On the other hand, at the time of protrusion (in thecondition where the catheter 30 protrudes forwardly relative to theguiding catheter 31, the external restrictive force exerted by theguiding catheter 31 is released, the clamping member 3A rises due to itsown elasticity as shown in FIG. 8, and is pushed by a distal end portionof the guiding catheter 31, to be turned as indicated by the arrow inFIG. 9. Thus, the clamping member 3A is shifted from the dot-dash-linestate to the solid-line state in FIG. 9 so that the clamping member 3Ais positioned in a forwardly protruded position (hereinafter referred toas the forward protruded position).

The clamping member 3A composed only of the-U-shaped wire member neednot necessarily be elastic. The clamping member 3A preferably has anoutside diameter of 0.1 to 2 mm. As the material forming the clampingmember 3A, SUS is ordinarily used. However, other materials which do notexert a bad effect on living bodies can also be used, for example gold,silver, platinum, tungsten, palladium, titanium, or alloys thereof.

The positioning means 40 includes a pair of comparatively long elasticwire members 41, 42, and a cable-like operating member 7 connected to abundled proximal end (base end) portion of the elastic wire members 41,42, and is so provided that it can be moved forwards and rearwards inthe catheter 30. The cable-like operating member 7 may be slidablypositioned in a long tube, for achieving smoother operations. The pairof elastic wire members 41, 42 have distal ends that protrude distallyrelative to the distal ends of the pointed members forming the needlepart 2 and that open wide to form a contained angle of about 90 degreeswhen their proximal end portions are located at the proximal (base)portion of the needle part 2.

At the time of storage, the elastic wire members 41, 42 are contractedtowards one another or restrained by the guiding catheter 31. However,when the catheter 30 is moved to protrude from the guiding catheter 31,the restraint is removed, and the elastic wire members 41, 42 open wide(spread out or diverge). Therefore, when the elastic wire members 41, 42protrude from the catheter 30 in the condition where the catheter 30protrudes from the right atrium R of the heart to the left atrium L ofthe heart, the elastic wire members 41, 42 make springy (elastic)contact with the aperture edge of the PFO 0, and display aself-centering function due to the exhibited elasticity.

Preferred specific examples of the elastic wire members 41, 42 are metalwires of stainless steel, nickel-titanium alloy, superelastic alloy(e.g., Ni—Ti alloy), or the like, with outside diameter of about 0.1 to0.5 mm. Incidentally, the elastic wire members 41, 42 comprising thepositioning means 40 are not limited to a pair of wire members, and maybe provided in a greater number.

The use and operation of this second embodiment of the PFO closingdevice is now described.

First, the operator operates the operating member 7 so that the needlepart 2 and the clamping member 3A are stored inside the catheter 30 asshown in FIG. 7. After the same operation as in the first embodiment hasbeen conducted and the distal end of the guiding catheter 31 has reachedthe position of the PFO O, the catheter 30 is inserted into the guidingcatheter 31.

When the distal end of the catheter 30 is positioned so that itprotrudes from the right atrium R of the heart through the PFO 0 to theleft atrium L of the heart, the operating member 7 is operated to movethe elastic wires 41, 42 such that they protrude from (distally beyond)the distal end of the catheter 30. This ensures that the elastic wiremembers 41, 42 are released from the restraint due to the guidingcatheter 31, and open wide to the opened condition. When the elasticwire members 41, 42 are slightly moved rearwards (proximally) by theoperating member 7 starting from the opened condition, the elastic wiremembers 41, 42 make springy (elastic) contact with the aperture edge ofthe PFO 0. As a result, the elastic wire members 41, 42 display aself-centering function due to their elasticity, whereby the needle part2 is located at the center of the PFO 0.

When the whole part of the catheter 30 together with the guidingcatheter 31 in this condition is pushed forwards (distally), the pointedmembers of the needle part 2 puncture the SP M2 in the vicinity of thePFO O. Also, when the catheter 30 is pushed forwards (distally) relativeto the guiding catheter 31, the clamping member 3A rises (pivotsforwardly) from the rear inclined position, as shown in FIG. 8. When theguiding catheter 31 is slightly moved forwards starting from thiscondition, the clamping member 3A is pushed by a distal end portion ofthe guiding catheter 31, to be turned into the forward protrudedposition, as shown in FIG. 9.

When the guiding catheter 31 is pushed further forwards, the clampingmember 3A is pushed by the guiding catheter 31, and is displaced towardthe side of the needle part 2, so that the SS M1 and the SP M2 areclamped between the clamping member 3A and the needle part 2.

While maintaining this clamping condition, the electricity supplyingunit is operated or controlled to supply a predetermined current throughthe lead wires 21, 22 in the same manner as in the first embodiment,whereon a current is passed between the clamping member 3A and theneedle part 2, and the tissues of the SS M1 and the SP M2 are fused toeach other.

After both the tissues are fused together, the passage of current isstopped, and the catheter 30 is retracted into the guiding catheter 31,whereby the positioning means 40 and the clamping member 3A are stored,followed by evulsion of the guiding catheter 31 together with thecatheter 30.

A third embodiment of the PFO closing device is shown in FIGS. 10-19. Inthe description which follows, features of the third embodiment of theclosing device which are the same as those associated with theembodiments described above are identified by the same referencenumeral, and a detailed description of such features is not repeated.

In this embodiment, a support 50 is provided at the distal end (tip) ofa catheter 30. In this illustrated embodiment, the support 50 is in theform of a multi-lumen type support 50. The needle part 2, the clampingmember 3B and the positioning means 40 pass respectively through thelumens in the support 50 to help facilitate compact and smoothoperations.

As shown in FIG. 10, the support 50 is positionally fixed at the distalend portion inside the catheter 30. As shown in FIG. 11, the support 50has five lumens. The elongated members of the needle part 2 pass throughfirst and second lumens L1, L2 in the support 50, and are positionallyfixedly attached to the support 50. The spaced apart legs of theclamping means 3B pass through third and fourth lumens L3, L4 in thesupport 50, and an elongated cable-like operating member 7 of thepositioning means 40 passes through a fifth lumen L5 at the center ofthe support 50. The support 50 may not necessarily be providedseparately from the catheter 30. Instead, a catheter 30 provided thereinwith a plurality of lumens (multilumen catheter) may also be used.

Energy supplying means similar to that shown in FIG. 1 includes one leadwire 21 connected to the proximal end of the needle part 2 and anotherlead wire 22 connected to an operating member 7 a for protruding(forwardly moving) and retracting (rearwardly moving) the clampingmember 3B through the support 50, and the lead wires 21, 22 areconnected to the electricity supplying unit in a manner similar to thatdescribed above.

More specifically, as shown in FIG. 10, the clamping member 3B in thisembodiment is composed of a single elastic wire member having anarc-shaped distal end portion so that the overall shape is hairpin-likein shape (with spaced apart legs connected by a curved distal endportion). In side view, as shown in FIG. 12, the clamping member 3B hasa horizontal part h located inside the support 50, a bent part f at thedistal end (tip) of the horizontal part 2 a, and a distal end (tip) partp extending from the bent part f in a tapering manner so as to graduallymove away from the needle part 2, so that the distance between thedistal end of the distal end part p and the needle part 2 isconsiderably large (increases in the distal direction) as indicated byX₁.

Therefore, when the operating member 7 a connected to the rear(proximal) side of the clamping member 3B is pulled, the wire memberconstituting the clamping member 3B receives a drag from the endportions of the lumens in the support 50, i.e., from the catheter sideto be thereby deformed as a whole toward the needle part 2, as shown inFIG. 14. The distance between the distal end of the distal end part pand the needle part 2 is considerably reduced, as indicated by X₂ inFIG. 14.

In plan view, as shown in FIG. 13, the clamping member 3B is so set asto have a width comparable to that of the needle parts 3. In addition,as shown in FIG. 10, in the vicinity of the bent part f, there isprovided a bridge-like stopper part S which abuts against the front face50 a of the support 50, thereby preventing the clamping member 3B fromretracting more than necessary (limiting the amount of retraction orrearward movement of the clamping member 3B relative to the support 50)during retraction of the clamping member 3B into the support 50.

Positioning means 40 includes a pair of elastic wire members 41, 42similar to those in the second embodiment. In addition, a positioningwire 43 shown in FIG. 13 which is adapted to abut on the PFO 0, isprovided at a central position between the pair of elastic wire members41, 42. The operating member 7 is connected to a proximal end (base end)part formed by bundling the wire members so that the positioning means40 as a whole can be moved forwards and rearwards (distally andproximally) along the lumens in the support 50 by operating theoperating member 7.

The material forming the clamping member 3B, is preferably a SUSmaterial with an outside diameter of 0.1 to 2 mm. However, othermaterials which do not exert bad influences on the living bodies mayalso be used, for example gold, silver, platinum, tungsten, palladium,or alloys thereof, Ni—Ti alloy, titanium alloys, etc. With respect tothe operating member 7 and the positioning means 40, wire members formedof such material as SUS, gold, silver, platinum, tungsten, palladium,alloys thereof, Ni—Ti alloy, titanium alloys, etc, and having an outsidediameter of 0.1 to 0.5 mm can be used.

The operation and use of this embodiment is now described.

FIGS. 15-19 show a procedure involving operating the PFO closing deviceaccording to this embodiment.

First, the operator positions the parts of the closing device so thatthe needle part 2 and the clamping member 3B are stored or positioned inthe guiding catheter 31. Then, the guiding catheter 31 is insertedthrough the inferior vena cava J into the patient's body.

When a distal end portion of the guiding catheter 31 has reached thevicinity of the PFO O, an inserting operation is performed so that thedistal end of the catheter 30 passes from the right atrium R of theheart through the PFO 0 to protrude into the left atrium L of the heart(see FIGS. 1, 4, and 5). When the distal end of the catheter 30 hasprotruded into the left atrium L of the heart, the operating member 7 isoperated so that the pair of elastic wire members 41, 42 protrude fromor beyond the distal end of the catheter 30, and the catheter 30 and theclamping member 3B are retracted. This helps ensure that the elasticwire members 41, 42 are opened wide, and then the operating member 7 ais operated so as to slightly return (move back) the elastic wiremembers 41, 42, whereby the elastic wire members 41, 42 are brought intospringy contact with the aperture edge of the PFO 0, as shown in FIG. 15as viewed from the side of the left atrium L of the heart. As a result,the self-centering function is displayed in the same manner as in theabove embodiments, whereby the needle part 2 is located at the center ofthe PFO 0. In addition, a proximal end portion of the positioning wire43 abuts on an edge portion of the PFO 0 constituting an end portion ofthe SS M1, whereby the position of puncture by the needle part 2 isbetter secured.

FIG. 16A is a front view of the PFO portion as viewed from the side ofthe right atrium R of the heart, and FIG. 16B is a sectional view alongthe line B-B of FIG. 16A. In the condition where the elastic wiremembers 41, 42 are opened wide, as shown in FIG. 16A, the distal endpart p of the clamping member 3B is located in the vicinity to bepressed of the SP M2, and the needle part 2 is located nearly at thecenter of the PFO 0. The positioning wire 43 abuts on an end portion ofthe SS M1, as shown in FIG. 16B, whereby the position of gripping at theentrance portion of the PFO 0 by the needle part 2 and the clampingmember 3B is determined accurately. In addition, the positioning wire 43also displays the function of pressing the SS M1 from the back side.

FIG. 17 is a view of the puncturing condition from the side of the rightatrium R of the heart, and FIG. 18 is a view of the puncturing conditionfrom the side of the left atrium I of the heart. In this condition, whenthe whole part of the catheter 30 is pushed forwards (distally) togetherwith the guiding catheter 31, the needle part 2 punctures the SP M2 inthe vicinity of the PFO 0 as shown in FIG. 18, and the clamping member3B is also moved together with the needle part 2, to a forwardly movedposition, as shown in FIG. 17. The SP M2 is deformed into a sector shapedue to the wide opening of the aperture edge of the PFO 0 by the elasticwire members 41, 42. At this stage, there is a spacing of about XIbetween the clamping member 3B and the needle part 2, so that the SS M1and the SP M2 are simply located between the needle part 2 and theclamping member 3B.

FIG. 19 is a view of the puncturing condition from the side of the rightatrium R of the heart. In this condition, when the operating member 7 aof the clamping member 3B is pulled axially rearwards, the clampingmember 3B is retracted along the lumens in the support 50, the bent partf of the operating member 7 a is deformed by the end portions of thelumens in the support 50 toward the side of the needle part 2, therebyfirmly clamping the SS M1 and the SP M2 between itself and the needleparts 2. While maintaining this clamping condition, the electricitysupplying unit is operated or controlled to supply a predeterminedcurrent through the lead wires upon which the current is passed betweenthe clamping member 3B and the needle part 2, whereby the tissues of theSS M1 and the SP M2 are fused to each other.

When the tissues are thus fused together, the passing of current isstopped, the operating member 7 is pulled to retract the positioningmeans 40, the operating member 7 a is operated to separate the clampingmember 3B from the tissue, these members are retracted into the insideof the guiding catheter 31 to attain the storage condition, and theguiding catheter 31 is evulsed. While the tissues are gripped by movingthe clamping member 3B by operating the operating member 7 in thisembodiment, a method of clamping the tissues through a sliding operationof the guiding catheter 31 may also be adopted as in the above-describedembodiment. Also, the gripping of the tissues by the clamping member 3Bmay be conducted after evulsing the positioning means 40 following thepuncture.

A fourth embodiment of the PFO closing device is shown in FIGS. 20-24.In the description which follows, features of this embodiment of theclosing device which are the same as those associated with theembodiments described above are identified by the same referencenumerals, and a detailed description of such features is not repeated.

This fourth embodiment is basically the same as the third embodiment,except that the positioning means 40 and the gripping member (clampingmember) 3B are somewhat different. As shown in FIGS. 20 and 21, asupport 50 is provided with six lumens. The elongated members of theneedle part 2 pass through first and second lumens L1, L2 of the supportand are positionally fixedly attached to the support 50. The spacedapart legs of the clamping member 3B pass through the third and fourthlumens L3, L4 of the support 50, and the positioning means 40 passesthrough fifth and sixth lumens L5, L6 located at intermediate positionsbetween the lumens L1, L2 and L3, L4.

The positioning means 40 in this embodiment is composed of a pair ofelastic wire members 41, 42. The elastic wire members 41, 42 areindependently inserted respectively in the fifth lumen L5 and the sixthlumen L6, and are so bent as to diverge away from each other at thedistal end (tip) side, thereby being opening wider. On the other hand,the wire members 41, 42 are bundled on the proximal (rear) end side, andconnected to an operating member 7. Therefore, when the operating member7 is operated, the elastic wire members 41, 42 are moved togetherforwards or rearwards along the lumens in the support 50, and are openedwider or contracted, narrower under the restraint by the lumens L5, L6.

This construction helps ensure that the elastic wire members 41, 42 aresupported by the lumens L5, L6. Therefore, even when a single operatingmember 7 a is operated, the elastic wire members 41, 42 would not berotated or deviated in the rotating direction but, instead, retainsecurely their positions of abutment on the PFO 0, whereby a centeringfunction for the needle part 2 is displayed assuredly. In addition, thegripping member (clamping member) 3B in this embodiment is increased indiameter at a distal end part p, thereof. By appropriately changing theouter diameter of the wire member itself constituting the grippingmember (clamping member) 3B, it is possible to display the same stoppereffect as that of the above-mentioned bridge-like stopper part S and aneffect of enhancing the gripping force. The distal end part p can beincreased in diameter not only by locally changing the outer diameter soas to obtain a step but also by covering the wire member constitutingthe gripping member (clamping member) 3B with another member so as toobtain a tongue-like member. This makes it possible to press the SP M2against the pair of needle parts 2 in a wider area, thereby enhancingthe. fusing property. The other member is preferably formed of the samematerial as the material of the gripping member (clamping member) 3B.

The use and operation of this embodiment of the closing device will bedescribed below. Since the operations of this embodiment are basicallythe same as those of the third embodiment, the following descriptionwill primarily discuss the positioning means 40. When the distal end ofthe catheter 30 inserted along the guiding catheter 31 has passed fromthe right atrium R of the heart through the PFO 0 to protrude into theleft atrium L of the heart L, an operation of moving the singleoperating member 7 forwards (distally) is conducted. This helps ensurethat the elastic wire members 41, 42 protrude from the distal end of thecatheter 30, and the elastic wire members 41, 42 are spaced away fromeach other to come into the wide-opened state.

When the elastic wire members 41, 42 are slightly moved rearwards(proximally) by operating the operating member 7 starting from thewide-opened condition, the elastic wire members 41, 42 come into springycontact with the aperture edge of the PFO 0, to display theself-centering function in the same manner as in the above embodiments,whereby the needle part 2 is located at the center of the PFO 0.

When the procedure is completed, the operating member 7 is pulled toretract the elastic wire members 41, 42 along the lumens in the support50. After the elastic wire members 41, 42 are retracted into the insideof the guiding catheter 31 to obtain the storage condition, the guidingcatheter 31 is evulsed. The gripping of the tissues by the clampingmember 3B may be conducted after the positioning means 40 is evulsedafter puncture, in the same manner as in the third embodiment. While theclamping member 3B is fixed by operating the operating member 7 in thisembodiment, a method of gripping the tissues through a sliding operationof the guiding catheter 31 may be adopted, in the same manner as in theabove embodiments.

FIGS. 25-27 illustrate a fifth embodiment of the PFO closing device. Inthe description which follows, features of this embodiment of theclosing device which are the same as those associated with theembodiments described above are identified by the same referencenumeral, and a detailed description of such features is not repeated.

In the above-described embodiments, there is no holding means forsecurely holding the SP M2 in a non retractable manner at the time ofpuncturing with the needle part 2. On the other hand, adopting amechanism by which the holding means and the positioning means can beoperated by a series of operations (hereinafter referred to aspositioning and holding means) can facilitate the puncturing with theneedle part 2. In addition, the speediness and assuredness of theprocedure are greatly enhanced, which naturally is preferable.Particularly, since the SP M2 is a membrane with a relatively smallthickness of about 1 to 2 mm, it is liable to be broken or damaged. Inview of this, when the SP M2 is held from the back side at the time ofpuncture, the procedure can be conducted relatively safely, withoutplacing an irrational burden on the SP M2. This is highly preferable.

The configuration of this embodiment of the closing device is similar tothose of the above-described embodiments regarding the aspects of thedevice other than the positioning and holding means.

As shown in FIG. 25, the positioning and holding means 60 in thisembodiment generally comprises a positioning part 61 for positioning theneedle part 2 in relation to the PFO O, and a holding part 62 forholding the SP M2 non-retractably in relation to the puncturingdirection of the needle part 2. The positioning and holding means 60 isconfigured so that when a long or elongated operating member 7 movablypositioned in a catheter 30 to be movable forwards (distally) andrearwards (proximally) protrudes from the distal end of the catheter 30and is moved axially forwards or rearwards, the positioning part 61 andthe holding part 62 can thereby be operated continuously.

The positioning and holding means 60 is provided at a distal end portionof the catheter 30 which is outfitted with a plurality of lumens L (L isthe generic symbol for lumens L1-L5 shown in FIG. 26) extending alongthe axial direction, and is normally stored in a guiding catheter 31. Atthe time of use, the positioning and holding means 60 is pushed out fromthe guiding catheter 31.

The catheter 30 in this embodiment is one in which the lumens are a partof the catheter 30 rather than a support, and the configuration is suchthat the catheter 30 can be thought of as being obtained by elongatingthe above-mentioned support 50. The catheter 30 is provided therein withfive lumens. The operating member 7 is movably positioned in an elasticmain tube 63 in a manner permitting forward and rearward movement of theoperating member 7. The elastic main tube 63 and the operating member 7pass through a centrally located lumen L5 so that the positioning part61 and the holding part 62 are operated by a hand-operated operatingpart 70 connected to the proximal end side of the operating member 7. Inthe following description, the hand-operated operating part side of thePFO closing device is referred to as “the proximal side”, and the sideof the needle part 2 or the SP M2 is referred to as “the distal side”.

The positioning and holding means 60 includes the positioning part 61and the holding part 62. The positioning part 61 includes the main tube63, the operating member 7, and a pair of first elastic wire members 66.The main tube 63 is positioned in the central lumen L5 having themaximum aperture diameter of the five lumens L1-L5, for reinforcing thecatheter 30 and recovering (by pulling) the positioning and holdingmeans 60 into the catheter 30. The operating member 7 is axially movableforwards and rearwards in the main tube 63. The two first elastic wiremembers 66, which are movable away from each other to open wider andtowards one another to contract narrower by the operation of theoperating member 7, connect the main tube 63 and an intermediate sleevebody 64 to each other. The holding part 62 includes an enlarged distalend portion 68 of the operating member 7, a tip sleeve body 65 spaced inthe proximal direction from the contact member 68, and a pair of secondelastic wire members 67 connecting the intermediate sleeve body 64 andthe tip sleeve body 65 to each other. In the illustrated embodiment, theenlarged distal end portion of the operating member 7 is constituted bya contact member 68 provided at the distal end portion of the operatingmember 7. The contact member 68 and the tip sleeve body 65 are adaptedto hold the SP M2.

The positioning part 61 centers the needle part 2 relative to the PFO 0by protruding the operating member 7 from the distal end of the maintube 63 and operating the operating member 7 to move axially forwards,thereby displacing the first elastic members 66 outwards so that thefirst elastic members 66 press the inner edge of the PFO 0 with springy(elastic or biasing) forces which are substantially equal. In short, thepositioning part 61 functions to position the needle part 2 locatedbetween the first elastic members 66 at a central portion of the PFO 0.

The holding part 62 has a curving mechanism W for curving the distal endportion of the operating member 7 through operation of the operatingmember 7 to move axially forwards or rearwards. The curving mechanism Wfunctions to curve the holding part 62 oppositely to the direction ofpuncturing the SP M2 with the needle part 2, so as thereby to hold theSP M2. The curving mechanism W includes the intermediate sleeve body 64,the tip sleeve body 65, the second elastic wire members 67 connectingthe sleeve bodies 64, 65 to each other, and the contact member 68.

The proximal ends of the first elastic wire members 66 are secured orfixed (e.g., welded) to the distal end of the main tube 63, and thedistal ends of the first elastic wire members 66 are fixed (e.g.,welded) to the intermediate sleeve body 64. On the other hand, theproximal ends of the second elastic wire members 67 are secured (e.g.,welded) to the distal end of the intermediate sleeve body 64, and thedistal ends of the second elastic wire members 67 are fixed (e.g.,welded) to the tip sleeve body 65.

Preferable specific examples of the first and second elastic wiremembers 66, 67 are metal wires formed of stainless steel,nickel-titanium alloy, superelastic alloy (e.g., Ni—Ti alloy) or thelike, with an outer diameter of about 0.1 to 0.5 mm. In addition, themetal wire may be covered with a resin (flexible) tube, for preventingthe elastic wire members 66, 67 from damaging the tissues.

The holding part 62 is configured so that the first elastic wire members66 on the proximal side are curved prior to curving of the secondelastic wire members 67 on the distal side, to position the needle part2, and then the operating member 7 itself is deformed while beingaccompanied by the contact member 68 and the tip sleeve body 65, so asto hold the SP M2 after the needle part 2 is positioned by thepositioning part 61.

Such a configuration is not particularly limited however. For example,there may be adopted an alternative in which the second elastic wiremembers 67 are formed of a material higher in stiffness than that forthe first elastic wire members 66, or an alternative in which a part ofthe first elastic wire members 66 is preliminarily worked by bending orthe like to form more easily deformable parts so that the first elasticwire members 66 are curved prior to curving of the second elastic wiremembers 67 through deformation of the easily deformable parts when apulling force is exerted thereon. This helps ensure that, with only theoperating member 7 pulled rearwards, the first elastic wire members 66on the proximal side come into abutment on the inner edge of the PFO 0,thereby positioning the needle part 2. With the operating member 7pulled further, the second elastic wire members 67 on the distal sideare thereafter deformed in the manner of projecting in an arcuate shaperadially outwards, whereby the SP M2 can be held non-retractably so thatthe puncture with the needle part 2 can be performed relatively easily.

As shown in FIGS. 25 and 26, the hand-operated operating part 70generally includes a first operating body 73 and a second operating body76. The proximal end of the catheter 30 is connected through aconnecting member 71 and a Y connector 72 to the first operating body73. The second operating body 76 is provided with through-holespermitting passage therethrough of a pair of slide rails 74 projectingfrom the proximal end of the first operating body 73. The secondoperating body 76 is able to move toward and away from the firstoperating body 73 by sliding along the slide rails 74. In FIG. 25, onlythe hand-operated operating part 70 is shown in reduced size forconvenience of space.

The main tube 63 passes through the inside of the first operating body73, and its proximal end is connected to the distal end of the secondoperating body 76. Therefore, with the second operating member 76 pulledrearwards, the whole part of the positioning and holding means 60 can berecovered into the central lumen L5 of the catheter 30. The main tube 63may be formed of a deformable elastic material such as polyimide resin,polyurethane, PET, nylon, fluoro-resin, polypropylene, etc. In addition,the hand-operated operating part 70 may be formed by use of a metallicpipe and be connected to the main tube 63 formed of an elastic material.

The proximal end of the operating member 7 is attached to a grip 78which is reciprocally slidable in a slide groove 75 formed in the centerof the second operating body 76. By reciprocally sliding the grip 78 inthe slide groove 75, the whole part of the operating member 7 isreciprocated in the main tube 63.

As shown in FIG. 27, the slide groove 75 is formed so that the width A1of the front half portion thereof is greater than the width A2 of therear half portion thereof. This helps ensure that, in the case where thegrip 78 is located in the front half of the slide groove 75, the grip 78can be inclined in a direction orthogonal to the axis of the slidegroove 75, whereby the operating member 7 can be turned about its axisinside the catheter 30, so as to rotate and adjust the position of itsdistal end. As a result, when the operating member 7 is operated byoperating the grip 78 in the hand-operated operating part 70, not onlythe position in the front-rear direction but also the rotationalposition can be adjusted. This enhances the procedure of inserting thedevice into the left atrium of the heart.

The needle part 2 constituting one side (one part) of the clamping means1 may be formed in a U-shaped overall form and inserted in a lumenformed by breaking the portion of the catheter between the lumens L1 andL2. Alternatively, the individual elongated members of the needle part 2may be disposed respectively in the lumens L1 and L2 as shown in FIG.26. In any case, a lead wire is connected to the rear end(s) needlepart(s) 2, and the lead wire passes through the Y connector 72 to theexterior, to be connected to the energy supplying means through acoupler 77.

The clamping member 3B constituting another part (other side) of theclamping means 1 has a distal end portion in which a generally U-shapedwire member is covered with a conductive material to provide atongue-like member (plate member). The proximal ends of the wire membersforming the clamping member 3B pass through the lumens L3 and L4 of thecatheter 30, and are connected to a single operating member 7 a. Theoperating member 7 a is operative to move the clamping member 3Bforwards and rearwards. In this embodiment, the operating member 7 a isconnected on the proximal side to a distal end portion of the secondoperating body 76.

The lead wires for the operating member 7 a and the needle part 2 passthrough the Y connector 72 to the exterior, and are connected to theelectricity supplying unit 2OA through a predetermined switch.

The use and operation of this embodiment will now be described belowwith reference to FIGS. 28A-28D which are schematic views showing theoperating conditions of the positioning and holding means. While theactual shapes and positions of the second elastic wire members 66 aresubstantially flush with those of the needle part 2 and the clampingmember 3B, they are shown in the state of having been displaced by 90degrees, for ease of understanding. Therefore, the deformed conditionsshown in the figures are different from the actual deformed conditions.

First, the operator retracts (rearwardly moves) the second operatingbody 76 of the hand-operated operating part 70 in relation to the firstoperating body 73, to obtain the condition where the needle part 2 andthe clamping member 3B are stored (positioned) in the guiding catheter31. In this condition, using a guide wire as a guide by the ordinarymethod, the distal end of the guiding catheter 31 is inserted into thepatient's body from a predetermined position of the body, to the rightatrium R of the heart. It is to be understood that a method may beadopted in which only the guiding catheter 31 is inserted into thepatient's, body, and thereafter the catheter 30 is inserted by use ofthe guiding catheter 31 as a guide. Next, by operating the firstoperating body 73, the distal end of the catheter 30 is passed from theright atrium R of the heart through the PFO 0 to protrude into the leftatrium L of the heart. Thereafter, the grip 78 is moved forwards tothereby forwardly move the distal end of the operating member 7 so thatit protrudes from the tip sleeve body 65 and is inserted into the leftatrium L of the heart. This protruded condition can be visuallyconfirmed externally if the contact member 68 or the like is providedwith a marker. However, if the protrusion is accompanied by abutment ofthe distal end of the operating member 7 against the inside wall of theleft atrium L of the heart or the like, the place where the distal endof the operating member 7 is located can be tactually confirmed, evenwhere visual confirmation is difficult to achieve. This enhances the useand operation. Where the grip 78 is located in the wider front halfportion of the slide groove 75 and is inclined, the tactual confirmationof the position of the distal end of the operating member 7 isfacilitated.

After the position of the distal end of the operating member 7 isconfirmed, the grip 78 is retracted until the contact member 68 of theoperating member 7 abuts on the tip sleeve body 65, as shown in FIG. 28B(the retraction amount is “δ₁” in FIG. 28B). Then, the first operatingbody 73 is operated to locate the second elastic wire members 67, theneedle part 2, and the clamping member 3B in the vicinity of the SP M2,and the whole body of the holding part 62 is inserted into the leftatrium L of the heart.

With the grip 78 retracted further (the retraction amount is “δ2” inFIG. 28C), the operating force of the retraction is transmitted by theoperating member 7 and through the contact member 68, the tip sleevebody 65, the second elastic wire members 67, and the intermediate sleevebody 64 to the first elastic wire members 66 which are firmly attachedto the distal end of the main tube 63. The first elastic wire members 66are deformed so as to project in arcuate shapes radially outwardly, asshown in FIG. 28C. It should be noted here, however, the second elasticwire members 67 are not yet deformed in this instance.

As a result, the first elastic wire members 66 are deformed whilepressing wider the aperture edge portion of the PFO 0, so that theneedle part 2 proximate to the first elastic wire members 66 is centeredrelative to the PFO 0, i.e., the needle part 2 is located in the centerof the PFO 0.

With the grip 78 retracted further until the proximal end of theintermediate sleeve body 64 abuts on the distal end of the main tube 63,as shown in FIG. 28D, the first elastic wire members 66 are notconsiderably more deformed, whereas the second elastic wire members 67on the distal side curve and are deformed in the manner of projecting inarcuate shapes radially outwards as illustrated, under theabove-mentioned operating force. As a result, inside the left heartatrium L, the contact member 68 and the tip sleeve body 65 come closerto the needle part 2, so that the contact member 68 and the tip sleevebody 65 abut on the face on the left atrium side of the SP M2, to holdthe latter.

In this condition, the first operating body 73 is moved forwards,whereby the pointed elongated members of the needle part 2 provided atthe distal end of the catheter 30 puncture the SP M2 at predeterminedpositions. The puncture condition is the condition shown in FIG. 1 inwhich the SS M1 and the SP M2 are present between the needle parts 2 andthe clamping member 3B.

Once puncturing is accomplished, the position of the needle part 2 isfixed in relation to the SP M2. At this stage, therefore, the secondoperating body 75 is once returned to make the first elastic wiremembers 66 and the second elastic wire members 67 straight, as shown inFIG. 28B. Then, the second operating body 75 is retracted so that thewhole body of the positioning and holding means 60 is recovered into thelumen L5 of the catheter 30 by the main tube 63.

At the time of this recovery, the operating member 7 a of the clampingmember 3B connected to the second operating body 75 also retracts theclamping member 3B along the lumens of the catheter 30, so that the bentpart f of the clamping member 3B are deformed by an end portion of thecatheter 30 toward the needle parts 2, to firmly clamp the SS M1 and theSP M2 between the clamping member 3B and the needle part 2.

While maintaining this clamping condition, the electricity supplyingunit 2OA is operated or controlled to pass a predetermined currentbetween the clamping member 3B and the needle part 2, whereby thetissues of the SS M1 and the SP M2 are fused to each other.

When the tissues are fused together, the passing of current is stopped,the first operating body 75 is retracted so that the needle part 2 andthe clamping member 3B located at the distal end of the catheter 30 arestored into the guiding catheter 31 together with the positioning andholding means 60, and the guiding catheter 31 is evulsed from thepatient's body.

FIG. 29 is a schematic perspective view of a sixth embodiment of the PFOclosing device. While the positioning and holding means 60 in the fifthembodiment has had a configuration in which the first elastic wiremembers 66 in the positioning part 61 and the second elastic wiremembers 67 in the holding part 62 are composed of separate members, thisembodiment adopts a configuration in which the two kinds of elastic wiremembers are integrated, to obtain a more simple configuration. Thepositioning and holding means 80 in this embodiment is configured suchthat the proximal end of a second sleeve body 81 is mounted to the maintube 63 protruding by a predetermined length from the distal end of thecatheter 30, an operating member 7 provided in the main tube 63protrudes from the distal end of the second sleeve body 81, and acontact member 68 is provided at the protruded distal end of theoperating member 7.

A positioning part 61 is composed of a pair of positioning pieces 82formed at a proximal (base) portion of the second sleeve body 81. Inthis case, the positioning pieces 82 are formed by slitting or cuttingoff a part of the second sleeve body 81, leaving end portions of thesecond sleeve body 81. The positioning pieces 82 are preferably formedin the shape of flat bands so that they make springy (elastic orbiasing) contact with the inner edge of the PFO 0. The positioningpieces 82 are thus elastically deformable.

On the other hand, the holding part 62 has a configuration as follows.The second sleeve body 81 protruding from the main tube 63 is providedwith two through-holes 83, 84 spaced in the axial direction. Theoperating member 7 leading from the main tube 63 into the second sleevebody 81 passes out to the exterior via the through-hole 84, is thenreturned into the second sleeve body 81 via the through-hole 83, andfurther extends and protrudes from the distal end of the second sleevebody 81. Thus, the operating member 7 extends through the second sleevebody 81 on the proximal side of the two through-holes 83, 84, extendsoutside the sleeve body 81 by way of the proximal most through hole 84,extends back into the sleeve body 81 by way of the distal most throughhole 83, extends through the distal end portion of the sleeve body 81,and then exits the sleeve body through the open distal end of the sleevebody 81. A contact member 68 is provided at the protruding distal end ofthe operating member 7.

Here, the second sleeve body 81 may be any tube that is deformable.Preferably, however, the second sleeve body 81 is a tube which can bevisually confirmed externally by use of X-rays or the like, and ispreferably composed of a synthetic resin such as polyurethane, PET,nylon, polyethylene, polyimide, fluoro-resin, polypropylene, etc.

In use of the positioning and holding means 80 configured as above, whenthe operating member 7 is pulled by an operation, the contact member 68abuts on the distal end of the second sleeve body 81, and the operatingforce in this instance acts on the entire second sleeve body 81 throughthe contact member 68. The positioning pieces 82 formed at a proximal(base) portion of the second sleeve body 81 are lower in stiffness thanthe other portions because of the formation of the slit or cutout.Therefore, the positioning pieces 82 are preferentially curved outwards,as if they were buckled, to abut on the inside surface of the PFO 0,thereby displaying a centering function, whereby the needle part 2 ispositioned at predetermined positions.

With the operating member 7 pulled further, the second sleeve body 81between the through-holes 83, 84 is curved, resulting in the SP M2 beingheld by the contact member 68 and the second sleeve body 81 a on thedistal side relative to the through-hole 83.

The positioning and holding means 80 in this embodiment thus has aconfiguration in which the second sleeve body 81 is mounted to the maintube 63 protruding from the catheter 30, and the second sleeve body 81is provided with the positioning pieces 82 at a proximal (base) portionthereof and with the two through-holes 83, 84 in a distal end (tip)portion thereof. Therefore, the positioning and holding means 80 in thisembodiment is simpler in configuration and advantageous in cost, ascompared with that in the above-described embodiment.

The use and operations of the positioning and holding means 80 in thisembodiment are substantially the same as in the fifth embodiment above.Therefore, the description of the use and operations is not repeated.

FIGS. 30 and 31 illustrate a seventh embodiment of the PFO closingdevice. The positioning and holding means 90 according to thisembodiment is similar in configuration to that in the fifth embodiment,except that it has a crease smoothing part 91 for smoothing out creasesof the SP M2. The shapes of the PFO O and the SP M2 differ from personto person. Specifically, the SP M2 can possesses creases or be creased,which make it difficult to specify the position of puncture by theneedle part 2. If the needle part 2 can be made to puncture the centerof the SP M2 in the condition where the creases are smoothed out, thesmoothness and facility of the procedure are enhanced, with the resultthat the assuredness of the treatment is enhanced, and the procedure canbe carried out relatively safely and speedily, all of which is quitepreferable.

In view of this, the positioning and holding means 90 in this embodimentgenerally has a positioning part 61 for positioning the needle part 2 inrelation to the PFO 0, a holding part 62 for holding the SP M2non-retractably in relation to the puncturing direction of the needleparts 2, and the crease smoothing part 91 for smoothing out the creasespresent in the SP M2. This embodiment is the same as the fifthembodiment above in that the positioning part 61 and the holding part 62can be continuously operated by moving a long operating member 7 axiallyforwards and rearwards, but this embodiment is different from the fifthembodiment with respect to the inclusion of the crease smoothing part91. Therefore, this aspect of the closing device will be described, anda detailed description of the other parts of the device, denoted by thesame symbols as used above, is not repeated.

As shown in FIG. 30, the crease smoothing part 91 is composed of a pairof third elastic wire members 92 connecting the intermediate sleeve body64 and the tip sleeve body 65 to each other. In the positioning andholding means 60 in the above-described embodiment, the intermediatesleeve body 64 and the tip sleeve body 65 are connected by only one pairof second elastic wire members 67. On the other hand, in the positioningand holding means 90 in this embodiment, the pair of third elastic wiremembers 92 are provided on the outside of the second elastic wiremembers 67.

The third elastic wire members 92, in the pre-deformation state shown inFIG. 30, are deformed so as to project radially outwards insubstantially the same plane as the first elastic wire members 66. It ispreferable that the third elastic wire members 92, in thepost-deformation state as shown in FIG. 31, are opened radially outwardsso largely as to smooth out the creases of the SP M2. In considerationof this point, in this embodiment, the third elastic wire members 92 arecomposed of members which are deformable in the manner of projectingoutwards more easily than the first elastic wire members 66. To be morespecific, the third elastic wire members 92 can be the same as the firstelastic wire members 66 in outer diameter and material, but can belarger in length (longer) than the first elastic wire members 66. Whilethe third elastic wire members 92 as shown in the figure are curved tosome extent, they may be curved outwards to an even greater extent.

In the use of the positioning and holding means 90 configured as above,in the same manner as in the above-described embodiments, the distal endof a catheter 30 is passed from the right heart atrium R through the PFO0 to protrude into the left heart atrium L, and the distal end of theoperating member 7 is protruded from the tip sleeve body 65 and insertedinto the left heart atrium L. Then, the operating member 7 is retracteduntil its contact member 68 abuts on the tip sleeve body 65, and theholding part 62 is inserted into the left heart atrium L.

With the operating member 7 retracted, the operating force istransmitted through the contact member 68, the tip sleeve body 65, thesecond elastic wire members 67, and the intermediate sleeve body 64 tothe first elastic wire members 66 firmly attached to the distal end of amain tube 63, whereby the first elastic wire members 66 are deformed sothat they project radially outwards into arcuate shapes. Where theprojecting deformation of the first elastic wire members 66 is performedin the vicinity of the PFO 0, the needle part 2 can be centered inrelation to the PFO 0. It should be noted here, however, that the secondelastic wire members 67 and the third elastic wire members 92—are notyet deformed at this time.

By further retracting or rearwardly moving the operating member 7, asshown in FIG. 31, the second elastic wire members 67 on the distal sideare curved. In addition, the third elastic wire members 92 are deformedin such a way that they project radially outwards into arcuate shapes.In this case, the third elastic wire members 92 are deformed indirections such as to smooth out the creases of the SP M2, i.e., indirections such as to projectingly deform along the plane of the SP M2,which is generally deviated by about 90 degrees from the plane in whichthe first elastic wire members 66 are deformed projectingly.

As a result, the contact member 68 and the tip sleeve body 65 hold theSP M2 from the left atrium L side of the heart, whereas the thirdelastic wire members 92 on the right atrium R side of the heart enterinto the creases of the SP M2, to smooth out the creases.

Therefore, the operator can relatively assuredly puncture apredetermined position of the SP M2, held by the holding part 62 fromthe side of the left atrium L of the heart and with its creases smoothedout, by the needle part 2 located in the center of the PFO 0.

After the predetermined position or portion of the SP M2 is puncturedwith the needle part 2, the whole body of the positioning and holdingmeans 90 is recovered into a lumen L5 of the catheter 30 by the maintube 63, whereon the SS M1 and the SP M2 are firmly clamped between aclamping member 3B and the needle part 2. While maintaining this clampedcondition, an electric current is passed between the clamping member 3Band the needle part 2, whereby the tissues of the SS M1 and the SP M2are fused together.

An eighth embodiment of the PFO closing device is shown in FIGS. 32-34.In the description which follows, features of this eighth embodiment ofthe closing device which are the same as those associated withembodiments described above are identified by the same referencenumeral, and a detailed description of such features is not repeated.

The positioning and holding means 60, 80, 90 in the above-describedembodiments are configured so that the SP M2 is held after positioning,and so that the positioning operation and the holding operation are toconducted sequentially. On the other hand, in this embodiment, thepositioning operation and the holding operation can be conductedsubstantially concurrently at a stroke, and the configuration thereforeis extremely simplified.

As shown in FIG. 32, the positioning and holding means 100 in thisembodiment includes a positioning part 61 composed of a pair ofelongated, comparatively long, elastic wire members 101 projecting in afanned (diverging) manner from the distal end portion of a catheter 30,and a holding part 62 in which a projecting part 102 is centrally formedby deforming the distal end (tip) portions of the elastic wire members101 into a substantially M-shaped form.

As shown in FIG. 34, the pair of elastic wire members 101 may beconnected to the distal end of an operating member 7 passing through acentral lumen L5, of a plurality of lumens L1-L5 formed in the catheter30, or the two elastic members 101 themselves may pass through thecentral lumen L5, to be led to a hand-operated operating device providedat a base portion of the device. In any case, the proximal end (base)portions of the elastic wire members 101 extend along tapered grooves103 formed in side portions of the outer periphery of the catheter 30.The tapered grooves 103 are configured to extend from the outerperipheral surface at side portions of the catheter 30 gradually towardthe inside of the catheter (the grooves 103 are tapered or angled sothat their depth is the smallest at the distal end portion of thegrooves and increases gradually or in a tapering manner in the proximaldirection). This allows the angle formed between the elastic wiremembers 101 to be set to a desired opening angle by regulating theinclination angle of the tapered grooves 103. Moreover, since theelastic wire members 101 are operated along the tapered grooves 103, theelastic wire members 101 can be relatively smoothly protruded from andretracted into the lumen L5 of the catheter 30, which promises goodoperationality.

The distal end (tip) portions of the elastic wire members 101 are bentcomparatively sharply to the inner side, and are then directed to theproximal side at a central area, to obtain the roughly M-shaped overallform, and to form the projecting part 102. The projecting part 102serves as a part for holding the SP M2 in relation to the puncturingdirection of the needle part 2, from the back side.

As is clear from FIG. 1, in the case of holding the SP M2 from the backside, it is preferable to set the projecting part 102 in the state ofbeing inclined against the plane formed by both the elastic wire members101. In the positioning and holding means 100 in this embodiment,therefore, after the guiding catheter 31 is inserted into the leftatrium L of the heart, the projecting part 102 is projected from an endportion of the guiding catheter 31, as shown in FIG. 33, so that the SPM2 can be relatively easily caught and held.

When the guiding catheter 30 is pulled into the right atrium R of theheart starting from the condition where the SP M2 is thus held by theprojecting part 102, the elastic wire members 101 are pulled anddeveloped into a fanned form, to make springy or elastic contact withthe inner peripheral edge portion of the PFO O, whereby the needle part2 is positioned substantially in the center of the PFO 0. The projectingpart 102 formed at the center of the elastic wire members 101 projectsto the back side of the SP M2, namely, to the side of the left atrium ofthe heart, so as to hold the SP M2. While maintaining this holdingcondition, the catheter 30 is moved forwards, whereby the needle parts 2puncture the SP M2. After the puncture, the elastic wire members 101 aremoved forwards, and are moved from the side of the left atrium of theheart to the side of the right atrium of the heart. Then, the elasticwire members 101 are recovered into the tapered grooves 103 in thecatheter 30, and the projecting part 102 is recovered into the lumen L5.

Then, in the condition where the needle part 2 and the clamping member3B clamp the SS M1 and the SP M2 therebetween, an electric current ispassed therebetween, whereby the tissues of the SS M1 and the SP M2 arefused together.

The positioning and holding means 100 in this embodiment is constructedso that the tip portions of the pair of elastic wire members 101 openedwider at a predetermined angle are deformed into the roughly M-shapedform. Therefore, it is quite simplified in construction and advantageouson a cost basis, as compared with at least some of the constructionsdescribed above in other embodiments.

The PFO closing device is not necessarily limited to the description setforth above and the above-described embodiments. For example, while theabove embodiments are described as being used in a therapeutic procedureof closing a defect of PFO, the application of the closing device is notlimited to this situation. For example, the device also has usefulapplication to closing a passage-like defect, such as the case of a leftatrial appendage.

In addition, while the PFO closing devices in the above embodiments areeach stored in a catheter and the clamping means is operated through theoperating member, this configuration is not limitative. For example, thePFO closing device can be combined with a so-called balloon catheter, tobe fed to a predetermined position.

The principles, embodiments and operational characteristics of theclosing device have been described in the foregoing specification, butthe invention which is intended to be protected is not to be construedas limited to the particular embodiments disclosed. The embodimentsdescribed herein are to be regarded as illustrative rather thanrestrictive. Variations and changes may be made by others, andequivalents employed, without departing from the spirit of the presentinvention. Accordingly, it is expressly intended that all suchvariations, changes and equivalents which fall within the spirit andscope of the present invention as defined in the claims, be embracedthereby.

What is claimed is:
 1. A patent foramen ovale closing device forbringing septum primum and septum secundum into contact with each otherand joining them together, comprising: a catheter dimensioned to bepositioned in a living body and advanced into an atrium of a heart; aneedle part movably positioned inside the catheter and possessing adistal end configured to puncture the septum primum; a clamping membermounted on the catheter and comprising: a linear part located inside thecatheter and possessing a distal end; a bent part at the distal end ofthe linear part which is bent and which extends away from the linearpart; and a distal end part at a distal end of the bent part andextending away from the bent part, the distal end part of the clampingmember axially overlapping with the needle part, the distal end part ofthe clamping manner extending away from the bent part in a mannergradually moving away from the needle part so that a distance betweenthe distal end part and the needle part gradually increases at furtherdistances from the bent part; the clamping member being axially movablymounted in the catheter so that a portion of the clamping memberprotruding from the catheter is retracted into the catheter as theclamping member is moved in an axially rearward direction relative tothe catheter; the bent part of the clamping member laterally movingtoward the needle part when the clamping member is moved in the axiallyrearward direction relative to the catheter so that the clamping memberand the needle part cooperate to clamp, between the clamping member andthe needle part, tissue of the septum primum and the septum secundum;and an energy supply operatively connected to at least one of the needlepart and the clamping member to supply energy to join the tissue clampedbetween the needle part and the clamping member.
 2. The patent foramenovale closing device according to claim 1, wherein the needle partcomprises a pair of spaced apart pointed wires.
 3. The patent foramenovale closing device according to claim 2, wherein the distal end partof the clamp member is a plate and the bent part of the clamping memberincludes at least one bent wire member connected to the plate.
 4. Thepatent foramen ovale closing device according to claim 2, wherein thedistal end part of the clamp member is a plate and the bent part of theclamping member includes a pair of spaced apart bent wire membersconnected to the plate.
 5. The patent foramen ovale closing deviceaccording to claim 1, wherein the bent part of the clamping memberincludes a pair of spaced apart wire members which are bent and whichare connected to the distal end part of the clamping part.
 6. The patentforamen ovale closing device according to claim 1, wherein the distalend part of the clamping part includes two spaced apart legs connectedtogether by a curved portion located remote from the bent part.
 7. Thepatent foramen ovale closing device according to claim 1, furthercomprising a support positionally fixed at a distal end portion insidethe catheter, the needle part passing through a lumen in the support. 8.The patent foramen ovale closing device according to claim 1, furthercomprising a support positionally fixed at a distal end portion insidethe catheter, the clamping member passing through a lumen in thesupport.
 9. The patent foramen ovale closing device according to claim1, wherein the needle part passes through a first lumen in the catheterand the clamping member passes through a second lumen in the support,the first and second lumens being spaced apart from one another.
 10. Thepatent foramen ovale closing device according to claim 1, wherein thebent part of the clamping member includes a pair of spaced apart wiremembers which are bent and which are connected to the distal end of thelinear part, and wherein the needle part comprises a pair of spacedapart pointed wires, and further comprising at least four lumens in thecatheter, the four lumens being separated from one another, the pair ofspaced apart pointed wires and the pair of spaced apart wire memberseach passing through a different one of the lumens in the support. 11.The patent foramen ovale closing device according to claim 10, whereinthe four lumens pass through a support that is positionally fixed at adistal end portion of the catheter.
 12. The patent foramen ovale closingdevice according to claim 10, wherein the wire members constituting thebent part are first wire members, and further comprising a pair ofsecond wire members having proximal ends connected to a common operatingmember which passes through a fifth lumen in the catheter and is movablypositioned inside the catheter, the fifth lumen being separate from thefour lumens.
 13. The patent foramen ovale closing device according toclaim 12, further comprising two wire members having proximal endsconnected to a common operating member movably positioned inside thecatheter.
 14. The patent foramen ovale closing device according to claim13, wherein the two wire members extend distally beyond a distal-mostend of the needle part.
 15. A patent foramen ovale closing device forbringing septum primum and septum secundum into contact with each otherand joining them together, comprising: a catheter dimensioned to bepositioned in a living body and advanced into an atrium of a heart; aneedle part movably positioned inside the catheter and possessing adistal end configured to puncture the septum primum; a clamping membermovably positioned inside the catheter and comprising: a linear partlocated inside the catheter and possessing a distal end; a bent wiremember at the distal end of the linear part which is bent and whichextends away from the linear part; and a distal end part at a distal endof the bent wire member and extending away from the bent wire member,the distal end part of the clamping member and the needle part axiallyoverlapping one another, the distal end part of the clamping mannerextending away from the bent part in a manner gradually moving away fromthe needle part so that a distance between the distal end part and theneedle part gradually increases at further distances from the bent part;the clamping member being axially movably mounted in the catheter sothat a portion of the clamping member protruding from the catheter isretracted into the catheter as the clamping member is moved in anaxially rearward direction relative to the catheter; the linear partpassing through a lumen in the catheter, the lumen being configuredrelative to the linear part and the bent part so that the axiallyrearward movement of the clamping member causes the bent wire member toenter the lumen, with entry of the bent wire member into the lumencausing the bent wire member and the distal end part of the clampingmember to laterally move toward the needle part so that the clampingmember and the needle part cooperate together to clamp, between theclamping member and the needle part, tissue of the septum primum and theseptum secundum; and an energy supply operatively connected to at leastone of the needle part and the clamping member to supply energy to jointhe tissue clamped between the needle part and the clamping member. 16.The patent foramen ovale closing device according to claim 15, whereinthe lumen is located in a support that is positionally fixed at a distalend of the catheter.
 17. The patent foramen ovale closing deviceaccording to claim 15, wherein the needle part comprises a pair ofspaced apart pointed wires.
 18. The patent foramen ovale closing deviceaccording to claim 15, wherein the clamping member includes a pair ofbent wire members and a pair of linear parts, each linear part beingconnected to one of the bent wire members, each of the linear partspassing through a respective lumen in the catheter, and the axiallyrearward movement of the clamping member causing each of the bent wiremembers to enter a respective one of the lumens to laterally move towardthe needle part.
 19. The patent foramen ovale closing device accordingto claim 19, wherein the distal end part of the clamping part includestwo spaced apart legs connected together by a curved portion locatedremote from the bent wire member.
 20. The patent foramen ovale closingdevice according to claim 15, wherein the lumen is a first lumen, andwherein the needle part passes through a second lumen in the catheterthat is separate from the first lumen.